# US 10,864,546 B2 · System for coating heat transfer tube for condenser

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- Number: US 10,864,546 B2
- Document ID: US10864546B2
- Status: Granted
- Kind: B2
- Application number: 16/151,527
- Filed: 2018-10-04
- Published: 2019-01-31
- Granted: 2020-12-15
- Earliest claimed: 2016-07-12
- Assignees: Doosan Heavy Industries Construction Co., Ltd
- Applicants: Doosan Heavy Industries & Construction Co., Ltd.
- Inventors: Jin Bum Kim; Hyun Sik Kim
- Web page: https://patentgrep.com/patent/US10864546B2

## CPC

- B05C 11/1039: {Recovery of excess liquid or other fluent material; Controlling means therefor}
- B05B 13/0214: {the liquid or other fluent material being applied to the whole periphery of the cross section of the elongated body}
- B05B 13/041: {with spray heads reciprocating along a straight line}
- B05B 13/0436: {Installations or apparatus for applying liquid or other fluent material to elongated bodies, e.g. light poles, pipes (B05B13/0442, B05B13/0463 take precedence)}
- B05B 14/00: Arrangements for collecting, re-using or eliminating excess spraying material (arrangements integral with nozzles B05B1/28)
- B05C 11/021: {Apparatus for spreading or distributing liquids or other fluent materials already applied to the surface of an elongated body, e.g. a wire, a tube}
- B05C 11/08: Spreading liquid or other fluent material by manipulating the work, e.g. tilting
- B23P 15/26: heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)}
- F28F 13/18: by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
- B05B 1/20: Perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
- F28F 19/02: by using coatings, e.g. vitreous or enamel coatings
- F28F 19/04: of rubber; of plastics material; of varnish
- F28F 2245/04: hydrophobic
- Y02P 70/10: Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
- B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08)
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A system for coating a heat transfer tube for a condenser is disclosed. The system simplifies a process of coating the heat transfer tube, and is able to uniformly coat a plurality of heat transfer tubes. In addition, the system is economically feasible in that coating solution can be reused by collecting and circulating it. Due to super-hydrophobic coating, the size of a droplet condensed on the surfaces of the heat transfer tubes coated by the system can be reduced, and a condensation heat transfer coefficient can be increased.

## Claims

### Claim 1

A system for coating a plurality of heat transfer tubes for a condenser, the system comprising:
at least one pair of stationary rotating units configured to rotate a cylindrical bundle in which the plurality of heat transfer tubes are arranged;
a pair of movable rotating units disposed below the cylindrical bundle to support the cylindrical bundle from a lower side of the cylindrical bundle;
a spray unit facing a circumference of the cylindrical bundle and configured to spray a coating solution onto respective surfaces of the plurality of heat transfer tubes;
a recovery unit disposed under the cylindrical bundle and configured to collect the coating solution remaining after the coating solution is sprayed onto the surfaces of the plurality of heat transfer tubes and flows downward over the surfaces of the plurality of heat transfer tubes; and
a circulation unit communicating with the recovery unit and configured to supply the collected coating solution to the spray unit.

### Claim 2 (depends on 1)

The system according to claim 1, wherein each stationary rotating unit of the at least one pair of stationary rotating units is disposed below the cylindrical bundle to support the cylindrical bundle from the lower side of the cylindrical bundle.

### Claim 3 (depends on 1)

The system according to claim 1, wherein the at least one pair of stationary rotating units includes a pair of stationary rotating units respectively disposed at longitudinally opposite ends of the cylindrical bundle.

### Claim 4 (depends on 1)

The system according to claim 1, wherein each stationary rotating unit and each movable rotating unit is configured to rotate within a speed range of 4 deg/min to 8 deg/min.

### Claim 5 (depends on 1)

The system according to claim 1, wherein the movable rotating units are disposed between the stationary rotating units of a pair of stationary rotating units.

### Claim 6 (depends on 1)

The system according to claim 1, wherein the pair of movable rotating units is respectively disposed on opposite sides of the center of the cylindrical bundle.

### Claim 7 (depends on 6)

The system according to claim 6, wherein each movable rotating unit is configured to move up, to push the cylindrical bundle higher against one stationary rotating unit of each pair of the at least one pair of stationary rotating units.

### Claim 8 (depends on 7)

The system according to claim 7, wherein the cylindrical bundle pushed higher against one stationary rotating unit is moved with respect to the spray unit, so that the coating solution is sprayed onto the respective surfaces of the plurality of heat transfer tubes from one side of an apex of the cylindrical bundle.

### Claim 9 (depends on 7)

The system according to claim 7, wherein each movable rotating unit is configured to move down, to lower the cylindrical bundle pushed higher against one stationary rotating unit, while the other movable rotating unit is moved up.